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(No-Model.) v v I W.-E.- maoaow. FIRE ALARM TELEGRAPH SYSTEM.

No.52-6,893. PatntedOatjZ, 1894.

NITED STATES PATENT OFFICE.

WILLIAM E. DEOROW, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO GAMEWELL FIRE-ALARM TELEGRAPH COMPANY, OF NEW YORK, Y.

FIRE-ALARM-TELEGRAPH SYSTEM.

SPECIFICATION forming part of Letter s Patent No. 526,893, dated October 2, 18,94.

' Application filed March 13,1893. Serial No. 465,754. (N model.) 5

.To all whom it may concern.-

Be it known that I, WILLIAM E. DECROW, a citizen of the United States, residing at Bos. ton, county of Suffolk, State of Massachusetts, have invented a certain new and useful Improvement in Fire-Alarm-Telegraph Systems,

of which the following is a specification, ref- 1 ent sections-of the town. It has been found,

stations is provided with a repeater, and one of the lines extending therefrom is made to connect with the central station. I also provide at a point outside of each local station a switch for disconnecting all of the local lines from said station, and placing them in v series with one another so that, since one of them, as above stated, is connected with the central station, all of these lines form one part of a long circuit which may be operated from the central station, and over which any signal from the local district may be communicated to the central station. By this arrangement any one of the local stations may become disabled by fire or otherwise and yet the system will not be interrupted because after the said switch has been turned, the circuits will be in connection with the main office, and thus establish temporary commu-s nication, although of course not with such good effect because the circuit will be of great length and subject to accidents upon any part of the extended territory which it covbe disabled by fire or otherwise an'd yet cause no interruption of the working of the system through thelocaldistricts. I

Referring to the drawings A is a'central station, and B and O are local stations, which may beas numerous as desired, and placed in any convenient section of the city. Referring, for example, to the local station B, a number of lines radiate therefrom to serve the immediate neighborhood. In the drawings I have shown such circuits marked D, E and F respectively. These circuits are preferablyquite short so that any accident will disable but a comparatively small part of the system. On these circuits are'located the usual signal boxes, and'if desired, bells, registers, or other apparatus. In the present instance, however, I have shown .a separate circuit extending through the district and including the large bells so that these bells may be operated independently either from the local stations, or, as I haveshown in this instance, from the central station A. The three circuits D, E and F come into station B through aswitch-board G, which is preferably placed at a point outside of the station so as to be safe from any injury in the event of any accident happening in the station. This switch-board is arranged as follows: The two terminals of the circuit are brought to a series of switch levers H, H, which are arranged in pairs corresponding to the respective circuits. Preferably all these levers are connected together so as to be operated manually by a single bar or handle J. The levers H, H, remain in the position shown in the drawings with free ends in contact with terminals leading to the station B. There are, however, a second set of terminals upon which the lovers H, H, may be thrown by a longitudinal movement of handle J. The second set of terminals are connected as shown in the drawings, the two outer ones being connected by a wire K, and the innerterminals connected in pairs by wires L, L; The normal circuit therefore will be as shown with the lines connected directly to station vers. At the same time the main station may in the circuit of line D is automatically re-" well known design, by means of which a sig-.

nal coming in on any one of the circuits is automatically repeated upon all the remain- 1 I have shown for the purpose ing circuits. of illustration, a simple form of repeater, although any other suitable type can be used. In the repeater which I have shown there are three disks M corresponding to the respective circuits. In each of the circuits is a relay or controlling magnet N which when energized, attracts a detent O and holds the disk M against rotation. It is understood that each disk is prdvided with a traintending to rotate it whenever it is released by detent 0. Each disk M has an outer notched rim P and inner notched cam R, and when M is rotated, rim P comes in contact with a spring S and R comes in contact with a spring The spring S forms one terminal of a local circuit having a battery Q and including repeater magnet V and a series of stop magnets the stop magnets W when energized throwa detent into engagement with a notch on the periphery of disk M and holds it against rotation. The spring T when disk M- rotates, is thrown up by cam R and thereby closes a short circuit around the contact points a, a, a. The action of this repeater is as follows: Assuming all the lines to be closed,

if the signal is sent from a box upon line D, for example, there will be a series of breaks corresponding to the signal which is being sent. net N will be de-energized thereby releasing disk M which'will then complete one rotation and be caught by the detent O as the circuit is again closed andmagnet N energized. The release of disk M immediately closes the local circuit by the contact of spring S with rim P, the opposite terminal of the battery being in connection with the metal of the disk. The closing of the local circuit first energizes all the .detent magnets W which prevents the movement of any of the other disks, and it then energizes magnet V which immediately opens the circuit of the lines E and F. It

does not afiect the circuit of line D since its contact point a is short-circuited by the contact of spring T with its back stop under the pressure of cam R. In this manner the break At each break of the circuit the magpeated on the lines E and F, and as the time of rotation of the disk M is adjusted relatively to the time of the break madeby the signal box so that the magnet N becomes energized and draws up detent 0 before the disk has completed its rotation, the parts will be restored after each break to their original condition ready for operation by the succeeding break.

At the central station A whither the loop from line F extends, there is a relay magnet X acting upon a register or other recording apparatus in the usual manner, but I have indicated also an automatic slow repeater which in general is of a type not novel with me, and which may be used or not as desired. In general this consists of a registering tape upon which is embossed by the stylus on the armature of local magnet Z a series of grooves corresponding to the impulses caused by the sending of the box number. This paper is marked b, and is led from the ordinary feed roll a over a second the box number, and thereby repeats at a slower rate the impulses over a bell circuit g extending throughout the corresponding local district. The bell circuit g, however, may be operated manually or the bells may be included in thelocal circuits D, E and F. It will be well understood that other local stations will be duplicates of station E.

I may also find it convenient to place a repeater at the central station A to which the lines from the several districts will be led so that the signals from one district may be completed to another district through the central station A. Such an arrangement is indicated in Fig. 2.

What I claim as new, and desire to secure by Letters Patent,is-

1. In a signaling telegraph system the combination with a central station and one or' more local stations with circuits extending therefrom, a circuit connecting the local stations with the central station, and a switch at the local station for disconnecting the circuits therefrom and connecting them in series with the central station.

2. The combination with a central station and a local station, of a circuit connecting them, a series of circuits extending from the local station, and a switch placed at apoint outside thelocal station for disconnecting the lines therefrom, and connecting them in series with the central station.

In testimony whereof I have heretoset my hand this 9th day of March, 1893.

WILLIAM E. DEOROW.

Witnesses:

EDWIN ROGERS, OTIs T. PETTEE.

IIO 

